Odorants

Abstract

The invention relates to compounds of the general formula in which R 1 to R 7 are, independently, H, methyl or ethyl, R 8 +R 9 together form methylene (—CH 2 —) or a single bond, or R 1 +R 2 together form —(CH 2 ) n —, with n being 3 or 4, or R 3 +R 5 or R 5 +R 7 represent methylene or a single bond; and the presence of at least one cyclopropane ring in the molecule is compulsory and the side chain can be saturated or contains one double bond in position α,β or β,γ, a process for the manufacture of these compounds, compounds used to perform the process and the use of these compounds as an odorant or as an ingredient of an odorant composition.

What is claimed is:  
     
       1. Compounds of the formula                    
       wherein R 1 , R 2 , R 4  and R 6  are H, methyl or ethyl, or R 1 +R 2  form —(CH 2 ) n —, with n being 3 or 4. 
     
     
       2. 1-[2-(2,2,3-Trimethylcyclopent-3-enylmethyl)cyclopropyl]ethanone. 
     
     
       3. 1-[1-Methyl-2-(2,2,3-trimethylcyclopent-3-enylmethyl)cyclopropyl]-ethanone. 
     
     
       4. 1-(2,2,3-Trimethylcyclopent-3-enylmethyl)spiro[2.4]heptan-4-one. 
     
     
       5. An odorant composition comprising at least one compound of formula 1:                    
       wherein the radicals R 1 , R 2 , R 4 , and R 6  are H, methyl or ethyl, or R 1 +R 2  form —(CH 2 ) n —, with n being 3 or 4.